Bart claimed that Neanderthal man was an ancestor of man, which is inaccurate. Neanderthal man's existence overlapped with modern man, and there is evidence Homo sapiens interbred with Neanderthals.
The old man at the nursing home complained he wasn't able to watch the History Channel because the nursing home didn't have a converter box. A cable channel like History wouldn't have been affected, since converter boxes only covered over the air (OTA) networks like NBC or CBS.
Why didn't Lisa buy a converter box and a video game? The converter box can go as cheap as $40, depending on the market.